Vice Admiral William S. Sims, Commander, United States Naval Forces Operating in European Waters, to the Office of the Chief of Naval Operations
Date 7 August 1918. <16/5/26>
To Opnav. Washington.
Prepared by N-5. Approved NCT Code 46 ARD No. 2487
2487 URGENT. My 2212 We feel so certain that minelaying submarine will operate in Vineyard Sound and Nantucket Sound August 10 that counter measures in mining are recommended. 14407 2487.
Source Note: Cy, DNA, RG45, Entry 517B.